Habib Marwan's technician Yassir and at least five other terrorists occupied the otherwise empty facility. There, Yassir used an encrypted microwave uplink to communicate with Robert Morrison, who was preparing a recently-stolen American "S-series" Legacy nuclear weapon for use against an American target. Marwan personally arrived at the location at about 3:10am, and helped Yassir and Morrison speed up the process for launching the nuclear strike. After they finished, they began to leave, but a TAC team led by Jack Bauer and Curtis Manning had arrived. Yassir and three other terrorists were quickly killed, and Marwan was cornered and temporarily captured. However, the CTU personnel realized the grim situation when they observed Marwan's laptop showing live footage of the nuclear missile automatically launching from an untraceable location. ("Day 4: 3:00am-4:00am")

CTU is ambushed by hidden terrorists.

Jack attempted to persuade Marwan to help find and stop his missile in exchange for any deal he wished to make with the president. But, as mastermind behind all the terrorism throughout the entire day, Marwan simply refused. As they loaded Marwan into a CTU vehicle in the parking lot, at least two terrorists who had been hiding suddenly attacked, killed 4 agents, and permitted Marwan to escape. Unable to find Marwan again, CTU left the factory and focused its efforts on its next lead: the interrogation of Richard Heller. ("Day 4: 4:00am-5:00am")